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    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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  <body>
    <ul>
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
    </ul>

    <script>
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      console.log(html);
      console.log(html.parentNode); // document
      console.log(html.parentElement); // null
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